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TDA1220B Fiches technique(PDF) 7 Page - STMicroelectronics

No de pièce TDA1220B
Description  AM-FM QUALITY RADIO
Download  18 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA1220B Fiches technique(HTML) 7 Page - STMicroelectronics

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APPLICATION INFORMATION (continued)
FM Section
IF Amplifier and limiter
The 10.7 MHz IF signal from the ceramic filter is amplified and limited by a chain of four differential stages.
Pin 16 is the amplifier input and has a typical input impedance of 6.5 KW in parallel with 14 pF at 10.7 MHz.
Bias for the first stage is available at pin 14 and provides 100% DC feedback for stable operating conditions.
Pin 15 is the second input to the amplifier and is decoupled to pin 14, which is grounded by a 20 nF capacitor.
An RLC network is connected to the amplifier output and gives a 90
° phase shift (at the IF centre frequency)
between pins 13 and 12. The signal level at pin 13 is about 150 mV rms
FM Detector
The circuit uses a quadrature detector and the choise of component values is determined by the acceptable
level of distortion at a given recovered audio level.
With a double tuned network the linearity improves (distortion is reduced) and the phase shift can be
optimized; however this leads to a reduction in the level of the recovered audio. A satisfactory compromise
for most FM receiver applications is shown in the test circuit.
Care shoul be taken with the physical layout.
The main recommandations are:
Locate the phase shift coil as near as possible to pin 13.
Shunt pins 14 and 16 with a low value resistor (between 56Ω and 330Ω).
Ground the decoupling capacitor of pin 14 and the 10.7 MHz input filter at the same point.
AM-FM Switching
AM-FM switching is achieved by applying a DC voltage at pin 13, to switch the internal reference.
Typical DC voltages (refer to the test circuit)
Pins
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Unit
AM
9
1.4
9
1.4
1.4
8.4
9
0.7
1.9
9
0
0.1
0.1
8.5
8.5
8.5
V
FM
9
0.02
9
0.02
0.02
8.5
9
0
1.7
90998
88
V
7/18
TDA1220B


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